Wraith

The wraith is a very interesting ghost as it is the only type of ghost with the ability that can allow the ghost to go through doors and see through doors. It will become a threat if your sanity is too low. Once it starts hunting, make sure you hide and break line of sight with doors. Though it says that it can go through walls, it actually can't and only go through doors.

Evidence: Fingerprints, spirit box, and freezing temperatures.